The present invention relates to an anode carbon material for lithium ion secondary batteries and particularly, to calcined petroleum coke use in such a carbon material. The present disclosure also discloses a production method. The calcined oil coke is created by subjecting a heavy oil composition to a coking process that is delayed. The resulting product is characterized by an atomic ratio between hydrogen atoms and carbon atoms (1/C atomic ration) ranging from 0.30 to 0.50. It also has a micro-strength ranging from 7 to 17%.
As a result of oil processing, crude petrol is separated by distillation into light and heavy oils. The heavy petroleum, also known as petroleum coal, is porous and has a metallic sheen. Its shape is irregular, it's dark gray or black in color, with a porous texture. This byproduct has many uses in everyday life, such as anode and paste for electrolytic Aluminum, carbon industry production, graphite and carbonizing agent, smelting of industrial silicon, and as fuel.
Calcined petroleum has a high chemical stability, even under extreme conditions. This makes calcined petroleum coke a good anode in lithium-ion cells. The presence of graphite in the crystal structure of calcined oil coke is responsible for its high electrical conductivity. This also provides a resistance against degradation when lithium ions are present.
The calcined petroleum is also rich in amorphous, amorphous and amorphous carbons that act as conductors. They also have a low specific heat. These characteristics provide superior energy density and cycling performance for the battery.
The anode carbon material according to the present invention consists of a mixture of amorphous carbon and ordered graphite particles. The amorphous particles have an average diameter of less than 30mm and a specific energy of 0.9W/kgK. The peak positions and widths on the diffraction line were used to determine the order of the graphite particles. The diffraction pattern for the anode material shows that the ordered graphite particle order is higher than the raw petroleum coke.
The anode carbon material, according to the invention, exhibits a high level of electrical conductivity. It also has outstanding durability even under extreme conditions. The amorphous carbon particles act as an efficient conductor and prevent short circuit of the anode during charging and discharging. The amorphous carbon is also able to absorb the lithium ions reversibly and to release them. As a result, the anode can operate over a wide operating voltage range. This allows the battery's charge to be done at a lower rate and its discharge to be at a faster rate. This helps to prolong the battery's lifespan. The anode-carbon material of this invention has very low impedance. It contributes to high energy densities and quick recharge times.
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